Oil pools are valuable underground accumulations of oil, and oil fields are regions underlain by one or more oil pools.
油藏是珍贵的地下石油堆积物，而油田是由一个或多个油藏所组成的地下区域。
Their tectonic framework was basically underlain in early Pleistocene or late Pliocene.
它们现在的构造格局基本上是在晚上新世或早更新世奠定的。
The nickel mineralization is contained in a layered basic massif surrounded and underlain by an archean gneiss complex.
此处镍矿化产于一层状基性岩块内，其四周和下面都为太古代片麻岩杂岩围绕。
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